A general investigation of cooling ducts located at various positions on a model of a typical pursuit airplane has been conducted in the NACA full-scale tunnel. Results are given in the present report for a duct located on the bottom of the fuselage with its inlet behind the leading edge of the wing. This installation is designated a rear underslung fuselage duct.nBecause of the thick boundary layers that existed at the inlets of rear underslung fuselage ducts, serious losses in total pressure occurred ahead of the heat exchanger. In order to eliminate these losses, tests were made with special vane installations designed to avoid boundary—layer separation and with ducts to bypass the boundary layer away from the main cooling duct.
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